One Note Wonder is about the notes in a chord! They're called "chord tones" and each one gets a number. Tap on these chord tones to hear what they sounds like.
Listen to the last note in each question. Can you figure out which chord tone it is? Drag the "tone stone" to the correct "chord tone" to discover a One Note Wonder!
Be careful, if you choose the wrong answer you could break too many "tone stones" and lose the game...